Yes, more than two-thirds of Earth is covered in water. But most of that ocean water is kept in the dark, and it's in those murky depths where certain microbes are believed to be trapping 15 to 45 percent of the carbon in the western North Atlantic Ocean, according to a new study. Those microbes might be found in similar amounts throughout the world. Frank Stewart, assistant professor in the School of Biological Sciences (with an appointment in the School of Earth and Atmospheric Sciences) did not participate in the study, but does give his take on the findings.